PowerDraw requires DirectX9.0 for hardware acceleration. Of course, you can recompile examples with "Hardware" flag set to False, in this case, PSR1.0 (PowerDraw Software Renderer) will be used and it only requires DirectX7.0.

EDIT: P.S. I don't care if you choose or not PowerDraw for your project. I provide support for PowerDraw users only, so I won't answer further questions about "why to choose PowerDraw" - sorry, I really hate doing non-technical stuff.